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Polymere Nematique En Peigne Sous Deformation
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Book Synopsis POLYMERE NEMATIQUE EN PEIGNE SOUS DEFORMATION by : VERONIQUE.. DEMANGE FOURMAUX
Download or read book POLYMERE NEMATIQUE EN PEIGNE SOUS DEFORMATION written by VERONIQUE.. DEMANGE FOURMAUX and published by . This book was released on 1998 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: UN POLYMERE CRISTAL-LIQUIDE EN PEIGNE ASSOCIE LES PROPRIETES D'ORIENTATION A GRANDE ECHELLE DES MOLECULES CRISTAL-LIQUIDE AUX PROPRIETES MECANIQUES DES POLYMERES. IL POSE DONC UN PROBLEME FONDAMENTAL : QUELLES SONT LES INFLUENCES DE LA STRUCTURE EN PEIGNE ET DE L'INTERACTION NEMATIQUE A LONGUE PORTEE SUR LA DYNAMIQUE DE LA CHAINE ? POUR REPONDRE A CETTE QUESTION, NOUS AVONS COMPARE LES PROPRIETES D'UN POLYMERE LINEAIRE, D'UN PEIGNE NON-NEMATIQUE ET D'UN PEIGNE NEMATIQUE. DANS UN PREMIER TEMPS, NOUS AVONS DETERMINE LES TEMPS DE RELAXATION DES CHAINES PAR RHEOLOGIE CLASSIQUE. DANS UN DEUXIEME TEMPS, NOUS AVONS ETUDIE LA RELAXATION DE LA CONFORMATION DES CHAINES APRES ETIREMENT EN FONCTION DU TEMPS, T, DE RELAXATION. CELLE-CI EST ENTIEREMENT CARACTERISEE PAR DEUX PARAMETRES : , LA DEFORMATION GLOBALE DE LA CHAINE ET P, LE NOMBRE DE MONOMERES RELAXES LOCALEMENT. POUR UN POLYMERE LINEAIRE EN REGIME DE ROUSE, CORRESPOND A LA DEFORMATION DE L'ECHANTILLON ET P AUGMENTE COMME T#1#/#2. POUR LE PEIGNE ISOTROPE, RESTE BIEN CONSTANT MAIS EST TOUJOURS INFERIEUR A LA DEFORMATION DE L'ECHANTILLON TANDIS QUE P AUGMENTE COMME T. PAR CONTRE, POUR LE PEIGNE NEMATIQUE, DECROIT EN EXPONENTIELLE ETIREE FONCTION DU TEMPS DETERMINE EN RHEOLOGIE ALORS QUE P RESTE CONSTANT. LA DYNAMIQUE TRES ORIGINALE DU PEIGNE ISOTROPE EST INTERPRETEE EN TERME D'AMAS VIVANTS FORMES PAR DES JONCTIONS TEMPORAIRES ENTRE DENTS DU PEIGNE. EN PHASE NEMATIQUE, LA DUREE DE VIE DE CES JONCTIONS EST FORTEMENT PROLONGEE ET LA RELAXATION NE PEUT PLUS SE FAIRE LOCALEMENT. LA RELAXATION SE FAIT DONC A PARTIR DES GRANDES ECHELLES ! CETTE ETUDE ASSOCIE RHEOLOGIE, DIFFUSION DES RAYONS X ET DIFFUSION DES NEUTRONS AUX PETITS ANGLES. NOUS AVONS AINSI RELIE, EN PLUSIEURS OCCASIONS, LES PROPRIETES MACROSCOPIQUES AUX PROPRIETES MICROSCOPIQUES.
Book Synopsis BROSSES DE POLYMERES ET SOLVANTS NEMATIQUES by : OLIVIER.. OU RAMDANE
Download or read book BROSSES DE POLYMERES ET SOLVANTS NEMATIQUES written by OLIVIER.. OU RAMDANE and published by . This book was released on 1998 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'INTERFACE ENTRE UNE BROSSE DE POLYSTYRENE ET UN CRISTAL LIQUIDE NEMATIQUE EST ETUDIEE GRACE A DES EXPERIENCES DE MOUILLAGE METTANT PRINCIPALEMENT EN OEUVRE DES TECHNIQUES OPTIQUES (INTERFEROMETRIE EN LUMIERE POLARISEE ET ELLIPSOMETRIE). DE LA TEMPERATURE AMBIANTE JUSQU'A 26\C ENVIRON, LE COMPORTEMENT D'UNE GOUTTELETTE NEMATIQUE DEPOSEE SUR UN TEL SUBSTRAT EST DECRIT PAR LA THEORIE DU MOUILLAGE PSEUDO-PARTIEL. DES FILMS MICROSCOPIQUES DE DEUX NATURES DIFFERENTES SE DEVELOPPENT AUTOUR DE LA GOUTTE IMMOBILE : UN PRECURSEUR SMECTIQUE S'ETALE D'ABORD AU-DESSUS DE LA BROSSE SECHE SELON UNE CINETIQUE SOUS DIFFUSIVE, IL EST SUIVI D'UN EPAULEMENT REVELANT LA PENETRATION DES MOLECULES DU NEMATIQUE A L'INTERIEUR DE LA COUCHE DE POLYMERE PAR DIFFUSION. L'ANCRAGE OBTENU A CETTE INTERFACE EST QUASI-PLANAIRE ET DE FAIBLE ENERGIE. SA LONGUEUR D'EXTRAPOLATION, DE L'ORDRE DE QUELQUES CENTAINES DE NANOMETRES A L'AMBIANTE, DIVERGE A L'APPROCHE DE LA CLARIFICATION. AINSI, DANS LE REGIME DE MOUILLAGE TOTAL OBSERVE AU-DELA DE 26\C, LES FORCES D'ANCRAGE ET LES DEFORMATIONS ELASTIQUES DU CRISTAL LIQUIDE IMPOSENT A LA GOUTTE D'AVOIR A L'EQUILIBRE UNE FORME DE CREPE DONT L'EPAISSEUR EST VOISINE DE LA LONGUEUR D'EXTRAPOLATION. AU-DESSUS DE LA TRANSITION NEMATIQUE ISOTROPE, LA GOUTTELETTE S'ETALE COMPLETEMENT. L'ETUDE REVELE EN OUTRE QUE LA CONFIGURATION OU LE DIRECTEUR EST CONFINE DANS LES PLANS MERIDIENS D'UNE GOUTTE NEMATIQUE EST INSTABLE AU VOISINAGE DE LA TRANSITION OPTIQUE. ON OBSERVE ALORS L'APPARITION DE NOMBREUX DEFAUTS DE FORCE 1, ORGANISES EN RUBANS. ENFIN, DES EXPERIENCES PRELIMINAIRES DE DEMOUILLAGE DU CRISTAL LIQUIDE SUR DES BROSSES SATUREES INDIQUENT QUE LA DESTABILISATION DU FILM PEUT SURVENIR SOIT PAR NUCLEATION HETEROGENE, SOIT PAR DECOMPOSITION SPINODALE, SUIVANT SON EPAISSEUR INITIALE.
Book Synopsis POLYMERES MESOMORPHES EN PEIGNE by : Pascale Fabre (chimiste).)
Download or read book POLYMERES MESOMORPHES EN PEIGNE written by Pascale Fabre (chimiste).) and published by . This book was released on 1986 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: MESURES DES CONSTANTES D'ELASTICITE ET DE VISCOSITE DE TORSION DE CES POLYMERES; PROPRIETES DE TRANSPORT PAR DIFFUSION DE RAYLEIGH FORCE DE LA LUMIERE
Book Synopsis Polymères mésomorphes en peigne by : Claire Weill (auteur d'une thèse en sciences).)
Download or read book Polymères mésomorphes en peigne written by Claire Weill (auteur d'une thèse en sciences).) and published by . This book was released on 1984 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Advances in Integrated Design and Manufacturing in Mechanical Engineering by : Grigore Gogu
Download or read book Recent Advances in Integrated Design and Manufacturing in Mechanical Engineering written by Grigore Gogu and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents recent advances in the integration and the optimization of product design and manufacturing systems. The book is divided into 3 chapters corresponding to the following three main topics : - optimization of product design process (mechanical design process, mass customization, modeling the product representation, computer support for engineering design, support systems for tolerancing, simulation and optimization tools for structures and for mechanisms and robots), -optimization of manufacturing systems (multi-criteria optimization and fuzzy volumes, tooth path generation, machine-tools behavior, surface integrity and precision, process simulation), - methodological aspects of integrated design and manufacturing (solid modeling, collaborative tools and knowledge formalization, integrating product and process design and innovation, robust and reliable design, multi-agent approach in VR environment). The present book is of interest to engineers, researchers, academic staff, and postgraduate students interested in integrated design and manufacturing in mechanical engineering.
Download or read book Journal de physique written by and published by . This book was released on 1999 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Chemist's Guide to Valence Bond Theory by : Sason S. Shaik
Download or read book A Chemist's Guide to Valence Bond Theory written by Sason S. Shaik and published by John Wiley & Sons. This book was released on 2007-12-04 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reference on current VB theory and applications presents a practical system that can be applied to a variety of chemical problems in a uniform manner. After explaining basic VB theory, it discusses VB applications to bonding problems, aromaticity and antiaromaticity, the dioxygen molecule, polyradicals, excited states, organic reactions, inorganic/organometallic reactions, photochemical reactions, and catalytic reactions. With a guide for performing VB calculations, exercises and answers, and numerous solved problems, this is the premier reference for practitioners and upper-level students.
Book Synopsis Dictionary of Building and Civil Engineering by : Don Montague
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Download or read book Unidentified written by Robert Salas and published by Career Press. This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1969 the U.S. Air Force issued a statement that read' "No UFO reported, investigated and evaluated by the Air Force was ever an indication of threat to our national security." This statement is patently false. It has been proven untrue by the testimony of many military officers and airmen and documentation of incidents involving UFOs and nuclear weapons, testimonies of which the U.S. Air Force was fully aware. Unidentified details many of these testimonies, some for the first time. As partial justification for its position, the Air Force cites a University of Colorado study that was contracted and paid for by federal funds. Unidentified reveals how this study was actually just another part of the plan to cover up the reality of the UFO phenomenon. For the first time, Unidentified publishes evidence that the investigators for the Colorado study knew about the UFO-related missile shutdown incidents but did not investigate them or include them in their final report.
Book Synopsis Lost Secrets of the Sacred Ark by : Laurence Gardner
Download or read book Lost Secrets of the Sacred Ark written by Laurence Gardner and published by HarperCollins UK. This book was released on 2004 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Ark of the Covenant is the source of one of the deepest mysteries of the Western world. Laurence Gardner has accessed Rosicrucian archives to reveal where the Ark is, what it is and how this lost secret of the distant past has led to the phenomenal new science of space-time manipulation.
Book Synopsis UFOs are Real by : Clifford E. Stone
Download or read book UFOs are Real written by Clifford E. Stone and published by S.P.I. Books. This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Encounter with Tiber by : Buzz Aldrin
Download or read book Encounter with Tiber written by Buzz Aldrin and published by Open Road Media. This book was released on 2013-05-28 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Apollo 11 astronaut and the Nebula Award–nominated author of Directive 51 present a novel that “conveys the wonder and promise of space” (Publishers Weekly). Born the year of the Moon landing, Chris Terence spends his life fighting to return humanity to that pinnacle. An engineering student with dreams of spaceflight, he finds upon graduation that the United States no longer has need for astronauts. Years of bureaucratic meddling have reduced the space program to a shell of itself, and it will take the greatest scientific find in history to send humanity skyward once more. After years battling budget hawks, Chris finally gets his chance to walk on the Moon. While there, he finds evidence of an ancient alien civilization, the Tiberians, who visited Earth’s satellite eight thousand years before. Understanding what happened to those long-forgotten travelers will define the lives of Chris and his son, as they fight against all odds to unlock the secrets of the universe. “The collaboration of the first man to pilot a moon lander (Aldrin) with a major voice in contemporary science fiction (Barnes) has produced a fascinating chronicle of man’s first encounter with alien intelligence” (Booklist).
